Micrometer-calipers.



P. 0. JAQUES, Jn.

mcnomnn OALIPEBS. APPLICATION FILED JUNE 11, 1907.

902,492. Patented Oct. 27,1908.

, up wear) is composed of only movable members, one of which is a rotatable UNITED s ATEs PATENT OFFICE.

FERNANDO O. JAQUES, JR., OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO WINSO'R &

JERAULD MANUFACTURING COMPANY, OF PROVIDENCE, RHODE ISLAND, A CORPO- RATION OF MAINE.

HICROMETER-CALIPBRS.

Specification of Letters Patent.

Patented Oct. 27, 1908.

To all whom it may concern:

Be it known that I, FERNANDO O. JAQUES,

Jr., acitizen of the United States, residing at Providence, in the county of Providence and State of Rhode Island, have invented a new and useful Improvement in Micrometer-Calipers, of which the following is a specification.

This invention has reference to an improvement in micrometer calipers and more particularly to an improvement in micrometer calipers having or adapted to have measurement-indicating means reading to one thousandth of an inch or less.

The leading object of my present invention is to provide for readings in plain figures and by means of ordinary scales similar to those of the foot rule, so as to obviate the mental calculations required by verniers and by the ordinarv graduations of micrometer calipers, and t us to prevent the mistakes due to such calculations.

Another object is to provide'for so indicating in plain figures successive multiples of a micrometric fractional unit, in a series as long as may be required, by means of a micrometer cali er of the simplest form, which (apartfrom the customary means for taking two relatively and longitudinally movable spindle member and the other is a frame member, and in which the screw-threaded portions are inclosed and protected against dirt and rust and the movable sleeve is inclosed and protected against accidental disturbance.

Another object of my invention is to improve the construction of a micrometer caliper ada ted to give readings to one ten thousan thof an inch, whereby such readings of the caliper are easily accom lished without the use of dials or similar evices, the construction of the caliper is simplified and the cost of manufacturmg the same reduced.

Other objects are set forth in the general description which follows.

My present invention consists in certain novel combinations of parts hereinafter set forth and claimed, and in an improved micrometer caliper embodying the same or any of them.

Figure 1 is a side view of my improved micrometer caliper. Fig. 2 is an enlarged detail view, showing the frame broken away and the caliper barrel in the position it would assume to show a reading of one-half an inch or five hundred one-thousandths of an inch. Fig. 3 is an enlarged longitudinal sectional view taken on line 3 3 of Fig. 2, and Fig. 4 is an enlarged transverse sectional view taken on line 4 4 of Fig. 2.

In the drawings, a indicates the U-shaped frame of the call er, 6 the anvil end of the frame, a the spin e end of the frame, at the tubular sleeve extending from the frame end 0, c the spindle, f the barrel on the spindle, g the frictional turning member on the end of the barrel, and k the magnifying glass secured to the sleeve (1 of the caliper.

The tubular sleeve d has a longitudinal opening 5, on one edge of which is a one-inch scale divided into thirty-seconds of an inch and on the opposite edge a one-inch scale divi-ded into fortieths of an inch, a transverse opening 6 having scales along its sides indi eating one one-thousandth of an inch divided into ten equal parts by alternate lines on the respective sides of the opening to indicate the ten-thousandths of an inch, and an internal tube 7 having the screw-threaded bore 8 for the s indle e, and a split end 9 having the tare externally screw-threaded portion 10,

ig. 3. The tube 7 forms an annular s ace 11 intermediate the sleeve 0? and the tn e 7 for the barrel f; and a nut 12, Fig. 3, for taking up wear, is screwed onto the split end 9 of the tube 7 within the same space.

The s indle 2 has the usual measuring end 13 which extends through a hole in the frame end a, the screw-threaded portion 14 having a suitable micrometer screw-thread in screwthread enga ement with the bore 8 of the tube 7, and t e stud 15 on its outer end having the screw-threaded hole 16 in its outer end for the screw 17, as shown in Fig. 3.

The barrel f has the outer end 18 in which is a central hole 19 for the stud 15 by which the barrel is secured to the spindle e by driving the same onto the stud 15. The barrel has on its peripheral face a circumferential transverse mdex line 20 which shows through the longitudinal opening 5 in the sleeve d and indicates measurements of one thirty-second or one fortieth of an inch on its res ective scales, a series of longitudinal a nation lines 21 dividin the peripheral ace of the barrel into e ua spaces each of which is the equivalent of one one-thousandth of an inch, this being the micrometric fractional unit, and figures forming numerals from zero to 999 in succession in a continuous spiral line, corresponding to the pitch of the thread 14 v on the spindle e, and arranged in longitudinal I rows associated with said graduation lines 1 21, respectively, parallel to each barrel. These lines 21 and the figures associated therewith show successively through the transverse opening 6 in the sleeve 11 and indicate measurements of thousandths of an inch.

The frictional turning member 9 consists of a thimble 22 knurled on its peripheral face, as shown in Fig. 1, and having a central countersunk hole 23 in its outer end throu h which the thimble is rotatably secured to t e end of the stud 15 by the screw 17, and a left-hand coiled spring 24 secured at its outer end to the closed end of the thimble 22 (by an outwardly-bent end on the spring entering a hole in the thimble) and having a snug fit on the stud 15, as shown in Fig. 3.

The magnifying glass It consists of a suitable lens 25 mounted in the frame 26 which is secured to the sleeve d in a position to bring the lens over the opening 6 in the sleeve, as shown in Figs. 2 and 4.

In the operation of my improved micrometer caliper the measurement is taken by turning the frictional turning member g to the left to open the caliper. This movement tends to tighten the coils of the spring 24 onto the stud 15 thereby practically locking the frictional turning member g to thespindle e. In closing the caliper onto the work and in common. therewith other and to the axis of the to be calipered the frictional turning member 9 is turned to the right. This movement of the member 9 tends to uncoil the spring 24, leaving just enough frictional contact between the spring and the stud 15 to turn the spindle e,,when the end 13 of the spindle is brought into extremely delicate contact with the work, without jar and without depending on the delicacy of touch of the operator. The readings of the caliper in thirty-seconds and fortieths of an inch are given through the opening 5 by the annular transverse line 20, and in one-thousandths or ten-thousandths by the longitudinal lines 21 and said numeralforming figures through the opening 6 and lens 25 which latter magnifies the sameto the eye four or more diameters. In the position shown in Fig. 2, the reading of the caliper is one-half an inch, sixteen thirty-seconds of an inch, twenty fortieths of an inch, and five hundred one-thousandths of an inch.

By turning the barrel f to the left to brin the line 21 at the number 500 on the bang into alinement with the line havin the numeral 1 of the scale on the inner e e of the o ening 6, the reading would be five undred t ousandths and one ten-thousandth of an inch, which can be easily seen through the magm'f g glass h.

The ine on the sleeve (1 behind the magnifying glass It marked 0 may be termed dist nctlvelythe index line, and this line or the lines behind the magnifying glass as a whole and the opening 6, or their mechanical equivalents, may be termed measurement indicating means adapted to register with the graduation lines 21 successively and to expose to view the measurement indicating numerals on the barrel It is evident that the frame 26 of the mag nifying glass it could be pivotally secured to the sleeve (1 whereby the glass could lie flat with the sleeve f when not in use, or brought up into correct focus when the fine readings of the caliper are required, without materially affectin the spirit of my invention.

I hereby isclaim in favor of my com anion speo'fication forming part of an app ication for patent filed November 23, 1907, Se rial No. 403,446, all those patentable combinations of partshereinbcfore described which are genericwith reference to the sub'ect matter of my present specification an that of said companion s ecification.

Having thus escribed my invention, I claim as new and desire to secure by Letters Patent:

1. A micrometer caliper having, in combination, an internally screw-threaded part, a rotatable and endwise movable spindle having a threaded portion interacting therewith, a barrel movable with said s indle and provided on its periphery with gures formmg numerals representing successive thousandths from 0 to 999 for indicating micrometric measurements, arrangedin a spiral series correspondin with the screw t ead and in longitudina rows parallel to each other and to the axis of the barrel, and with longitudinal graduation lines dividing the periphery of the barrel into equal spaces each of which is the equivalent of one such thousandth, associated with the longitudinal rows of said figures, respectively, and an outer sleeve immovably connected with the part first named and rovided with a transverse index opening t irough which the appropriate measurement indicating figures on said barrel and a portion of the graduation line associated therewith are exposed to view and with an index line adjacent to said opening arranged to aline with said graduation lines successively.

2. A micrometer caliper having, in combination, an internally screw-threaded part, a rotatable and endwise movable spindle having a threaded portion interacting there with, a barrel movable with said spindle and provided on its periphery with figures forming numerals representing successive thousandths from 0 to 999 for indicating micrometric measurements, arranged in a s iral series correspondin with the screw t ead and in longitudina rows parallel to each other and to the axis of the barrel, and

part first named and provided with a transwith longitudinal graduation lines dividing I which are located alternately adjacent to the periphery of the barrel into equal spaces I opposite transverse edges of said opening and each of which is the equivalent of one such arran ed to read with reference to saidgraduthousandth, associated with the longitudinal ationIines on the barrel successively to indirows of said figures, respectively, and an I cate intermediate measurements, andamagouter sleeve immovably connected with the l nifying glass secured to said sleeve in a posipart first named and provided with a trans- I tion to locate its lens over said opening and verse index opening through which the apover said lines adjacent thereto.

pro riate measurement indicating figures 0n 4. In a micrometer caliper, the combinasai barrel and a portion of the graduation tion with a frame a, a sleeve (1, a s indle 6 line associated therewith are exposed to having the stud 15 with the screw-t readed view, together with an index line adjacent hole 16 in its end for a screw 17 and a barrel f to said opening arranged to aline with said on the spindle e, of a frictional turning memgraduation lines successively and also prober 9 consisting of a knurled thimble 22 havvided with scales the graduation lines of I ing a central countersunk hole 23 through which are located adjacent to opposite transwhich the thimble is rotatably secured to the verse edges of said opening and are arranged I end of the stud 15 by the screw 17 and a left to read with reference to said graduation hand coiled spring 24 secured atone end to lines on the barrel successively to indicate the thimble 22 by an outwardly-bent end on intermediate measurements.

the spring entering a hole in the thimble and 3. A micrometer caliper having, in comhaving a snug fit on the stud 15, as described. bination, an internally screw-threaded art, 5.

In a micrometer caliper, the combinaa rotatable and endwise movable spindletion of the following instrumentalities: a having a threaded portion interacting there- U-shaped frame a having the anvil end 6 and with, a barrel movable with said spindle and the spindle end 0, a sleeve (1 having a longiprovided on its periphery with figures formtudinal opening 5 and a transverse opening 6 ing numerals representing successive thou on the spindle end 0 of the frame a, an msandths from 0 to 999 for indicating microternal screw-threaded tube 7 on the s indle metric measurements, arranged in a spiral end 0 in the sleeve (1, a screw-threade spinscrics corresponding with the screw thread dle e in the tube 7 and extending through a and in longitudinal rows parallel to each hole in the spindle end 0 of the frame a, a other and to the axis of the barrel, and with barrel f on the spindle e in the sleeve (1 and longitudinal graduation lines dividing the having a transverse line, a series of longiperiphery of the barrel into equal spaces tudinal lines and numeral-forming figures each of which is the equivalent of one such reading from zero to 999 in a continuous thousandth, and associated with the longispiral line on the peripheral face of the barrel, tudinal rows of said fi ures, respectively, an

outer sleeve immovab y connected with the l a frictional turning member 9 on the spindle e, and a magnifying glass it secured to the sleeve d in a position to bring the lens 25 over the transverse opening 6, as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

verse index opening through which the appropriate measurement indicating figures on said barrel and a portion of the graduation line associated therewith are exposed to view, together with an index line adjacent FERNANDO O. JACQUES, Jr. to said opening arranged to aline with said Vitnesses:

graduation lines successively and also pro- ADA E. HAGERTY,

vided with scales the graduation lines ofi J. A. MILLER. 

